Remember, though, it's not a date - just a meeting. No matter how much you like someone when you are chatting online and looking at their photo, you really can't know much until you meet in real life. You might not like their smell, their tics, their voice - a million things. So don't put too much pressure on the first meet - it's just an opportunity to see if you ARE attracted enough to go out.
And in the same vein - don't put all your eggs in one basket. That's one of the oddities about online dating, by its very nature you have several lines in the water at once. She might like you but then before you meet she has lunch with some other guy who has also been writing to her and they hit it off - happens all the time. It's no harm, no foul in online dating - you just have to expect stuff like that to happen. SO make sure you are still at least looking around.